The changing level and composition of central city employment and the revenue performance of city tax systems are at the heart of the study of urban problems, and each of these topics has been a subject of extensive research. Study of the relationship between the two, however, has focused on how tax levels affect location decisions. The mirror issue - how employment changes affect tax levels -has not been given serious attention. The specific objective of this paper is to identify and measure the revenue yield implications of the changing composition of city employment.